Worst air pollution Chichester, today and tomorrow
Today (16 July): Air quality in Chichester is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 5:00 PM (O3: 29.1/100).
Tomorrow (17 July 2026): Air quality in Chichester is fair. AQI improves to medium; NO2 decreases to medium; all other pollutants stay as today. Pollution peaks around 8:00 PM (NO2: 47.3/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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The A2 sees the heaviest traffic, and that shows up clearly in local roadside monitoring. Chichester's air quality reflects its position within West Sussex, with local traffic and the town's built-up core as the main contributors. Residential heating and light industry add a modest seasonal contribution, though the area's changeable Atlantic weather keep overall levels moderate.
Today - 16 July | Pollution peaks at 17:00
AQI:
Fair
29.1/100
PM2.5 (fine particles):
Good
10.8/100
PM10 (coarse particles):
Good
3.9/100
NO2 (nitrogen dioxide):
Fair
27.2/100
O3 (ozone):
Fair
29.1/100
SO2 (sulfur dioxide):
Good
2.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.2/100
PM1 (ultrafine particles):
Good
8.3/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 20:00
AQI:
Medium
47.3/100
PM2.5 (fine particles):
Good
15.6/100
PM10 (coarse particles):
Good
5.3/100
NO2 (nitrogen dioxide):
Medium
47.3/100
O3 (ozone):
Fair
23.0/100
SO2 (sulfur dioxide):
Good
4.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.5/100
PM1 (ultrafine particles):
Good
15.1/100
Pollen forecast in Chichester
View pollen forecastFrequently Asked Questions
Is air quality bad in Chichester right now?
On 16 July 2026, overall air quality in Chichester is fair. AQI is the main air quality indicator at 29.1/100. Pollution peaks around 5:00 PM (O3: 29.1/100).
Will air quality be worse tomorrow in Chichester?
On 17 July 2026, air quality conditions in Chichester will be similar to today, with O3 forecast at fair at 23.0/100. Pollution peaks around 8:00 PM (NO2: 47.3/100).
When is air pollution at its worst in Chichester?
Spring and autumn don't usually cause much concern, sitting comfortably between winter's peak and summer's ozone spikes. Here's the thing about Chichester: air quality has a clear seasonal rhythm. Winter mornings can be the trickiest, with cold, still conditions trapping A2 traffic fumes and smoke from home fires close to the ground. Warmer months swap one problem for another — less smoke and heating pollution, but more ozone on the sunniest days.
Are air quality levels in Chichester based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app